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8. Care and maintenance
Use a soft dry cloth to clean the unit. Never use strong detergents that contain alcohol,
ammonia, gasoline, or abrasives as they can damage the casing.
9. Disposal
Make sure you comply with local regulations when discarding the device. If you are not sure
what to do, contact your local authorities.
10. Specifications
Relative humidity (RH)
Measuring range
0 – 100 % RH
Repeat accuracy
± 0.2 % RH
Accuracy (Fig. 13)**
± 3.0 % RH
Response time
5 seconds
Long-term
measurement stability
1 % RH/year
Temperature
Measuring range
-40 to +70 °C (-40 to +158 °F)
Repeat accuracy
± 0.2 °C (± 0.4 °F)
Accuracy (Fig. 14)**
± 1.0 °C (± 2.0 °F)
Response time
20 seconds
Dew point
Dew point accuracy (Fig. 15)**
± 2.0 °C (± 4.0 °F) (at 25°C, 40-100 % RH)
Measurement interval
2 seconds to 24 hours
Operating temperature
-40 to +70 °C (-40 to +158 °F)
Battery
Battery
½AA/ER3 - 3,6 V (lithium)
Battery life*
1 year (at 5-second measuring interval)
* The battery life depends on updating interval, surrounding temperature and relative humidity,
and on whether or not the alarm is activated.
** See diagram.
Summary of Contents for ST-171
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